to void DOMA before married same-gender couples can file a joint Federal return. They already have the option of filing joint state returns in the places where equal marriage is the law.
I would imagine the same thing would be needed in the case of all other rights, DOMA needs to be found unconstitutional. We may already be at the point where that could happen. And watching Scalia's head explode would be the most fun of all, his dissent will be epic in the annals of hate masquerading as jurisprudence.